Aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due after one year (or one business cycle).

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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Related Parties - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 31, 2014
Related Party Transaction [Line Items]
Payment For Expenses On Behalf Of Private Equity Funds	$ 1,282	$ 1,218	$ 1,098
Subordinated Borrowings	22,550us-gaap_SubordinatedDebt	0us-gaap_SubordinatedDebt		22,550us-gaap_SubordinatedDebt
Other Assets [Member]
Related Party Transaction [Line Items]
Employee compensation arrangement	10,484	5,560
Investment Banking [Member] \| Director [Member]
Related Party Transaction [Line Items]
Revenue from related parties	1,251	14,090	2,000
Investment Management [Member] \| Private Equity Fund [Member]
Related Party Transaction [Line Items]
Revenue from related parties	$ 10,302	$ 11,557	$ 4,781